If you were moving a large piece of furniture and accidentally banged it into a wall and caused a large hole in the wall's drywall, then you will be pleased to know that this is an easy do-it-yourself project.
Fixing damaged drywall requires the following tools and supplies:
a putty knife
Follow these steps to fix your wall's large drywall hole:
Step 1: Cut a Piece of Replacement Drywall
Using your drywall saw, cut a piece of replacement drywall that is at least an inch larger than the damaged area.
Step 2: Trace the Replacement Drywall Piece onto the Wall
Place the replacement piece of drywall over the damaged area on your wall and trace around its outer perimeter using a pencil. Using a pencil is better than using a marker because you can easily erase any extra marks that get on the wall while you are working.
Step 3: Cut Out the Damaged Part of the Wall
Using your drywall saw, cut out the damaged area of drywall along the lines that you previously traced. Work slowly when removing the drywall to ensure that you do not cut too much material or go outside of the lines you drew.
Step 4: Tape Replacement Drywall Piece into Place
Put the replacement drywall in place and tape over its edges with drywall tape to hold it in place. Use a single piece of drywall tape on each seam and do not overlap them because it will make the surface uneven.
Step 5: Apply Joint Compound Over the Drywall Tape
Using your putty knife, apply joint compound over the drywall tape. After applying the joint compound, rub the putty knife's edge over the joint compound to smooth it out. The smoother you make the wet joint compound, then the less sanding that will be necessary.
Step 6: Sand the Dried Joint Compound
After the joint compound has had time to completely dry according to the manufacturer's specifications, sand it until it is flat with the rest of the wall.
Step 7: Re-Paint the Wall
Finally, the last step is to paint the drywall patch with the paint you originally used to paint your wall. If you no longer have any touch-up paint, then you will need to paint the wall in order for the patched area not to show when the sun shines on it.
Contact a structural engineer or another specialist for more help and information.